HD44780 LCD problems

[Ernestas]

Hello, bought PIC programer(mikroProg) from mikroElektronika and i have some problems with LCD could you help me out?

Im using PIC16F628A and Hitachi HD44780 LCD. My code in C looks like this :

sbit LCD_RS at RA0_bit;
sbit LCD_EN at RA1_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISA0_bit;
sbit LCD_EN_Direction at TRISA1_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;

char txt3[] = "Good job!!";

void main() {
      
      CMCON = 111;
      CCP1CON = 0;
      INTCON = 0;
      Lcd_Init();
      Lcd_Cmd(_LCD_CLEAR);
      while(1){
      Lcd_Out(1, 1,txt3);
                            };
}

I used this code in Proteus simulator and it have worked, but when i try in real life LCD screen show me only black boxes. I dont use external oscilliator maybe this is the problem? And i cant make RA0 and RA1 digital output. ANSEL = 0; dont work.. Could you help me out? Thank you.

 

[KlausST]

Hi,

did you read HD44780 datasheet about all the timings befor / during init phase?

The black boxes indicate that it is not initialized correctely.

Klaus

 

[andre_luis]

Another factor that also make black boxes is the LCD contrast not properly polarized.

 

[thannara123]

Check LCD contrast and crystal value ,connections